阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式(最多限填3个单词)。
A farmer had a donkey and a dog. Both the donkey and the dog (help) their master in many ways. One night, two thieves broke in the farmer's . The dog heard them and started barking. The farmer got and so did the neighbors. So they caught the two thieves.
The farmer said, "I'm glad I had this dog." The neighbors also thought so.
From that day, the donkey decided to show his master that he could also be (use) just like the dog.
One night, the thieves again entered the farmer's house. As the thieves looked in, they saw the dog (sit) just outside the main door. "It seems the dog is quite watchful," said one thief.
"We better go at once," the other thief said and then the two thieves went away. But unknown to the thieves, the donkey was watching all this. He thought, "It is a good chance for me to show master that I can be useful. The thieves have run away. If I start (shout), the master will thank me." So the donkey started braying(驴叫) (loud).
When the farmer heard the donkey, he angry. He came out with a stick and hit the donkey hard. "This will teach you not to bray at night," he thought.
